package com.xs.ahoi.hcxs.utils;

import android.graphics.Paint;
import android.widget.EditText;
import android.widget.TextView;

/**
 * author: ahoi
 * date: 2018/6/22 19:23
 * description:
 */
public class ViewUtil {


    public static void autoSplitText(final TextView tv) {
        final String rawText = tv.getText().toString(); //原始文本
        final Paint tvPaint = tv.getPaint(); //paint，包含字体等信息
        final float tvWidth = tv.getWidth() - tv.getPaddingLeft() - tv.getPaddingRight(); //控件可用宽度
        if (tvWidth == 0) {
            return;
        }

        //将原始文本按行拆分
        String[] rawTextLines = rawText.replaceAll("\r", "").split("\n");
        StringBuilder sbNewText = new StringBuilder();
        for (String rawTextLine : rawTextLines) {
            if (tvPaint.measureText(rawTextLine) <= tvWidth) {
                //如果整行宽度在控件可用宽度之内，就不处理了
                sbNewText.append(rawTextLine);
            } else {
                //如果整行宽度超过控件可用宽度，则按字符测量，在超过可用宽度的前一个字符处手动换行
                float lineWidth = 0;
                for (int cnt = 0; cnt != rawTextLine.length(); ++cnt) {
                    char ch = rawTextLine.charAt(cnt);
                    lineWidth += tvPaint.measureText(String.valueOf(ch));
                    if (lineWidth <= tvWidth) {
                        sbNewText.append(ch);
                    } else {
                        sbNewText.append("\n");
                        lineWidth = 0;
                        --cnt;
                    }
                }
            }
            sbNewText.append("\n");
        }

        //把结尾多余的\n去掉
        if (!rawText.endsWith("\n")) {
            sbNewText.deleteCharAt(sbNewText.length() - 1);
        }

        tv.setText(sbNewText.toString());
    }

    // 获取EditText光标位置
    public static int getCursorIndex(EditText mEditText) {
        return mEditText.getSelectionStart();
    }

    // 向EditText光标位置插入字符串
    public static void insertText(EditText mEditText, String mText) {
        mEditText.getText().insert(getCursorIndex(mEditText), mText);
    }

    // 向EditText光标位置删除字符串
    public static void deleteText(EditText mEditText) {
        int cursorIndex = getCursorIndex(mEditText);
        if (cursorIndex > 0) {
            mEditText.getText().delete(cursorIndex - 1, cursorIndex);
        }
    }
}
